The molecular cloud SGR B2 (10)

Details The molecular cloud SGR B2 (10) The molecular cloud SGR B2 (10)

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7610964s&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Interstellar Matter, Radio Sources (Astronomy), Carbon Monoxide, Clouds, Formaldehyde, Gas Dynamics, Interstellar Masers, Molecules, Radio Astronomy, Temperature

Scientific paper

The structure of the Sgr B2 molecular cloud was studied by detailed and extensive mappings of the CO, (C-13)O, CS, and H2CO (20 cm) transitions. The cloud consists of a dense core at the OH maser position plus a very large (r approximately equal to 45 pc) envelope. The total mass of the cloud estimated independently from calculated (C-13)O column densities, from application of the virial theorem, and from far infrared measurements is about three million solar mases. The molecular gass has an average temperature of approximately 20 K; this similarity to the temperature of grains emitting far infrared radiation is taken as evidence of near thermal equilibrium between dust grains and H2. The dynamics of the gas in the cloud were found to be dominated by large scale systematic motions with velocity not a monotonic function of radius.

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